in my opinion I must check the price of token after listing token price in exchange is high, I think its good to sell all token and if token price in exchange after listing low then hold that token until the price grow up or stable.
Typically, after entering the exchange, the price of tokens decreases because a lot of bounty hunters sell their tokens. This is one of the reasons for the price drop. If the project is good and has a future it is worth keeping the tokens until the price on the exchange increases again.